A6 / S6 (C5 Platform) Discussion Discussion forum for the C5 Audi A6 and S6 produced from 1998-2004

clattering/knocking sound from engine front

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Old 10-27-2003, 07:07 AM
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Default clattering/knocking sound from engine front

yesterday i noticed a sporadic clatterring/knocking sound from the front end of the engine much like a marble or small child's toy would make if caught inside a fan! the sound doesn't seem to increase proportionately to engine speed. originally thought it was something caught in one of the fans...found nothing. i'm thinking water pump. feedback most welcome. thanks
Old 10-27-2003, 07:18 AM
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Default If you have one, check the plastic cover over the intake runners.

Top center piece under the hood; it's just a "beauty piece" and a couple of the screws that hold it in place had come loose on mine...sounded like bad tappets.
Old 10-27-2003, 07:54 AM
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Default Re: clattering/knocking sound from engine front

the car w/noise is a 2000 2.7t
Old 10-27-2003, 10:31 AM
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Default Could it be something...

caught in the intake tube before the air filter?
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